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    <title>Document</title>
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<script>
    function copyObj(obj) {
        var obj2 = Array.isArray(obj) ? [] : {}
        for (var key in obj) {
            typeof obj[key] == 'object' ? obj2[key] = copyObj(obj[key]) : obj2[key] = obj[key]
        }
        return obj2
    }
    var obj = { name: 'zhangsan', age: 20, like: ['足球', '游戏'] }
    var obj2 = copyObj(obj)
    console.log(obj,obj2);
    obj.like.push('hah')
    console.log(obj,obj2);
</script>